Comparative study on photocatalytic decolorization of an anionic and a cationic dye using different TiO<sub>2</sub> photocatalysts

Different types of cobalt vanadate nanostructures such as Co 3 V 2 O 8 , Co 2 V 2 O 7 and CoV 2 O 6 have been successfully prepared via a simple solid-state method. For the first time, cobalt vanadate nanostructures were synthesized via Schiff-base ligand and vanadyl sulfate as a capping agent and vanadium source, respectively. The effect of a Schiff-base ligand (N,N-Bis (salicylaldehyde) ethylenediamine = H 2 salen) as a capping agent, molar ratio of Co: H 2 salen and Co:V on type of products, morphology and size of cobalt vanadate nanoparticles was investigated to reach optimum condition. The as-prepared nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmittance electron microscopy (TEM), Fourier transform infrared (FT-IR) spectra, energy dispersive X-ray microanalysis (EDX) and ultraviolet-visible (UV-Vis) spectroscopy. This work is the first study on photocatalytic activity of cobalt vanadate nanostructures in different conditions. The influence of different parameters such as type of cobalt vanadate nanostructures, type of dye, size of particles and nanostructures dosage as a catalyst on photocatalytic activity of samples were studied.

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“…The energy gaps of the samples have been determined by extrapolating the linear portion of the plots of (αhν) [40,41].…”

Section: Edx and Ft-ir Analysismentioning

confidence: 99%

Size controllable synthesis of cobalt vanadate nanostructures with enhanced photocatalytic activity for the degradation of organic dyes

Ghiyasiyan-Arani

Masjedi-Arani

Salavati‐Niasari

2016

Journal of Molecular Catalysis A: Chemical

108

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“…In addition to nano-Degussa P25, several commercially available TiO2 catalyst materials could be used for textile dyes' degradation. However, the plurality of research on TiO2 reported that P25 appeared to be the most effective catalyst for the degradation of azo dyes [13] and Acid Orange 7 and Methyl Orange [14]. When nano TiO2 is excited by UV radiation with a wavelength below 380 nm, that means the photons excite the valence band electrons across the bandgap into the conduction band, leaving holes behind in the valence band; then the produced holes will react with water molecules (H2O) or hydroxide ions (HO -) to produce hydroxyl radicals (•OH) [15].…”

Section: Icar 2022 Special Issuementioning

confidence: 99%

Treatment of Contaminated Textile Factories’ Wastewater by Photocatalyst Degradation

Hassan¹,

Hassan²,

Jasim³

et al. 2022

IJOIR

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The aim of this work is remove the textile factories’ wastewater such as dyes via the Advanced Oxidation Processes (AOPs) that on using the nano titanium dioxide photocatalytic degradation. The degradation of C. I. Reactive black 45 (RB 45) in aqueous medium by the photocatalysis process has been studied. The effects of several parameters such as pH, the concentration of TiO2, irradiation time, and dye concentration have been examined. The optimal parameters were found to be [TiO2] = 0.75 g/L, irradiation time 480 min and pH=3.0. The results shown that the photocatalytic degradation could be enhanced by adding hydrogen peroxide H2O2 or potassium persulfate K2S2O8, for example, the efficiency increased from 68.9% to 88.7% and 95.4% when added 0.027 M or 1.5 g/L of H2O2 and K2S2O8 respectively. Also, the effects of inorganic salts Na2SO4, Na2CO3, and NaCl on the degradation efficiency of the photocatalysis process were investigated.

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“…However, the surface area is not the only factor that affects the photocatalysts performance. In our earlier works, a comparative study has been performed on different commercial catalysts of TiO 2 having different surface areas for the photodegradation of synthetic dyes [7,30], the results have shown that TiO 2 particles size and surface area are not the only factors influencing their photocatalytic activity, but it is rather surface properties such as surface acidity and the crystalline phase. Vorontsov et al [31] have also concluded, in their study on the photocatalytic activity of several synthesized samples of TiO 2 , that TiO 2 surface area and particle size are only secondary factors influencing photocatalytic activity, while other surface properties such as acidity, surface structure, and also extent of surface hydroxylation should play a major role in obtaining high performance of the photocatalytic process.…”

Section: Kinetic Of Photocatalytic Degradationmentioning

confidence: 99%

Characterization of ZnO and TiO₂ Nanopowders and their Application for Photocatalytic Water Treatment

et al. 2020

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Zinc oxide ZnO nanoparticles synthesized by sol-gel method and commercial titanium dioxide TiO2 were studied in the present work. The structural properties of the ZnO and TiO2 nanoparticles were determined by Fourier transform infrared (FTIR), X-ray diffraction (XRD) and Raman spectra techniques (RS). The average crystallite sizes were calculated by using the powder X-ray and were found to be 48 nm and 20 nm and the specific surface areas were about 1047 m 2 g −1 and 381 m 2 g −1 for ZnO and TiO2, respectively. The FTIR and Raman spectroscopy results have shown high purity of the ZnO and TiO2 samples and they are consistent with the one obtained from XRD. The ZnO and TiO2 nanoparticles were used as catalysts for the elimination of an azo dye, Mordant Violet 5 (MV5), in aqueous solution, by an advanced oxidation process which is heterogeneous photocatalysis. Synthesized ZnO was more efficient than commercial TiO2 to degrade MV5 under UV irradiation. The adsorption of MV5 on TiO2 and ZnO was found favorable by the Langmuir approach. The MV5 adsorption constant on TiO2 was higher than that obtained in the case of ZnO. The photocatalytic reaction of MV5 in presence of each catalyst was investigated at different concentration of the dye and at different conditions of pH. The solar radiation of MV5 in the presence of each catalyst was also tested.

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Comparative study on photocatalytic decolorization of an anionic and a cationic dye using different TiO₂ photocatalysts

Cited by 16 publications

References 46 publications

Size controllable synthesis of cobalt vanadate nanostructures with enhanced photocatalytic activity for the degradation of organic dyes

Size controllable synthesis of cobalt vanadate nanostructures with enhanced photocatalytic activity for the degradation of organic dyes

Treatment of Contaminated Textile Factories’ Wastewater by Photocatalyst Degradation

Characterization of ZnO and TiO₂ Nanopowders and their Application for Photocatalytic Water Treatment

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Comparative study on photocatalytic decolorization of an anionic and a cationic dye using different TiO2 photocatalysts

Cited by 16 publications

References 46 publications

Size controllable synthesis of cobalt vanadate nanostructures with enhanced photocatalytic activity for the degradation of organic dyes

Size controllable synthesis of cobalt vanadate nanostructures with enhanced photocatalytic activity for the degradation of organic dyes

Treatment of Contaminated Textile Factories’ Wastewater by Photocatalyst Degradation

Characterization of ZnO and TiO2 Nanopowders and their Application for Photocatalytic Water Treatment

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Product

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Comparative study on photocatalytic decolorization of an anionic and a cationic dye using different TiO₂ photocatalysts

Characterization of ZnO and TiO₂ Nanopowders and their Application for Photocatalytic Water Treatment